WSU Extension


Annual bluegrass 
Bentgrass, creeping 
Birdfoot Trefoil 
Bittercress (Shotweed, Hairy bittercress) 
Bittersweet nightshade (European bittersweet) 
Black medic 
Blackberry (Himalayan, Evergreen, Pacific) 
Blue mustard (Purple mustard, Tenella mustard) 
Brackenfern, western 
Bull thistle 
Buttercup, creeping 
Butterfly bush 
Canada thistle 
Catchweed bedstraw (Cleavers) 
Catsear, common (False dandelion) 
Chickweed, common and mouseear 
Creeping Jenny 
Dock (Curly, Broadleaf) 
Downy brome (Cheatgrass, Downy chess) 
Dwarf mistletoes 
English daisy (Lawn daisy) 
English ivy 
Field bindweed (Wild morningglory) 
Field pennycress (Fanweed) 
Foxtail (Green, Yellow, Bristly) 
Garden loosestrife 
Giant hogweed 
Ground ivy 
Groundsel, common 
Hedge bindweed 
Herb Robert (Robert geranium, stinky Bob) 
Horsetails (Scouringrush) 
Horseweed (Marestail) 
Knotweeds (Bohemian, Giant, Japanese, Himalayan) 
Lambsquarters, common 
Lesser celandine 
Mallow, common (Cheeseweed, Buttonweed) 
Oxalis (Creeping woodsorrel) 
Parrotfeather and Eurasian watermilfoil 
Plantain (Broadleaf, Buckhorn) 
Poison hemlock 
Poison ivy and Poison oak 
Prickly lettuce (China lettuce) 
Prostrate knotweed 
Puncturevine (Tackweed, Goathead) 
Purple deadnettle (Red deadnettle) 
Purple loosestrife (Purple lythrum) 
Purslane, common 
Red sorrel (Sheep sorrel) 
Redroot pigweed (Rough pigweed) 
Redstem filaree (Stork's bill, Crane's bill) 
Reed canarygrass 
Russian thistle (Tumbleweed) 
Ryegrass, annual (Italian ryegrass) 
Salsify (Goatsbeard) 
Scotch broom 
Sowthistle, annual and perennial 
Spurges (Prostrate spurges) 
St. Johnswort, common (Goatweed, Klamathweed) 
Stinging nettle 
Tansy ragwort 
Tumblemustard (Jim Hill mustard) 
Velvetgrass (Common velvetgrass) 
Water primrose 
Waterhemlock, western 
Wild carrot (Queen Anne's lace) 
Yellow nutsedge 

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Caption: Annual ryegrass
Photo by: T.W. Miller
Weeds : Ryegrass, annual (Italian ryegrass) : Lolium perenne ssp. multiflorum
(revision date: 4/7/2021)

Family: Poaceae (Graminae)
Cycle: Annual
Plant Type: Grass

Use Integrated Pest Management (IPM) for successful weed management.

Annual ryegrass is upright, growing in clumps often reaching four feet tall. The flat leaf blades are shiny and about 1/8 to 1/4 inch wide. The veins are prominent, making the blades appear ridged. The ligule, occurring at the point where the leaf blade joins the leaf sheath, is short and membranous. Claw-like appendages (auricles) often clasp the stem near the base of the leaf blade. Seeds are borne in spikelets on long (to twelve inches), flat spikes at the tops of the stems. A related species, perennial ryegrass (L. perenne ssp. perenne) is commonly used in turf, but annual ryegrass is not recommended for lawn seed mixtures, as it tends to persist and is unattractive in the established lawns.
Annual ryegrass may be found on roadsides and is a major weed in cultivated areas. It is sometimes included in pasture and lawn seed mixtures as a cover crop for temporary turf.

Management Options

Non-Chemical Management
  • Maintaining a healthy planting or turf area to provide competition will prevent weed establishment.
  • Cultivation (rototilling or hoeing) will effectively eliminate plants.
  • Hand-pull to eliminate weeds.
  • Careful digging is useful to manage weed populations. However, digging can carry undesirable weed seed to the surface and foster further germination.
Select non-chemical management options as your first choice!

Chemical Management

Read the label for application timing of the products listed. Glyphosate products should be applied as spot treatments only! NOTE: Some ingredients listed here are only available in combination. Read the label carefully on combination products to make sure the product is suitable for your specific situation.

Landscape areas
  • glyphosate
  • dichlobenil
  • oryzalin
  • products containing benefin
  • trifluralin
  • products containing diquat
  • sethoxydim
  • fluazifop
Turf areas
    Bare ground areas
    • glyphosate
    • products containing diquat
    • dichlobenil

    + Show larger images

    Caption: Annual ryegrass
    Photo by: T.W. Miller
    Caption: Annual ryegrass seed heads
    Photo by: T.W. Miller
    Caption: Annual ryegrass auricles
    Photo by: R. Parker
    Caption: Annual ryegrass seedling
    Photo by: J. A. Kropf
    Caption: Ryegrass flowers
    Photo by: T. W. Miller
    Caption: Ryegrass shiny leaves
    Photo by: T. W. Miller
    Caption: Ryegrass spikelets
    Photo by: T. W. Miller